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Titolo:
TEMPERATURE-DEPENDENCE OF OXYGEN RESPIRATION, NITROGEN MINERALIZATION, AND NITRIFICATION IN ARCTIC SEDIMENTS
Autore:
THAMDRUP B; FLEISCHER S;
Indirizzi:
ODENSE UNIV,INST BIOL,CAMPUSVEJ 55 DK-5230 ODENSE M DENMARK MAX PLANCK INST MARINE MICROBIOL D-28359 BREMEN GERMANY
Titolo Testata:
Aquatic microbial ecology
fascicolo: 2, volume: 15, anno: 1998,
pagine: 191 - 199
SICI:
0948-3055(1998)15:2<191:TOORNM>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOUTH-ORKNEY ISLANDS; SUBSTRATE CONCENTRATION; MARINE-SEDIMENTS; ORGANIC-CARBON; SIGNY-ISLAND; SPRING BLOOM; GROWTH RATE; REDUCTION; ENVIRONMENT; SVALBARD;
Keywords:
BENTHIC AEROBIC COMMUNITIES; THERMAL ADAPTATION; Q(10); OPTIMUM TEMPERATURE; C-N MINERALIZATION RATIO;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
B. Thamdrup e S. Fleischer, "TEMPERATURE-DEPENDENCE OF OXYGEN RESPIRATION, NITROGEN MINERALIZATION, AND NITRIFICATION IN ARCTIC SEDIMENTS", Aquatic microbial ecology, 15(2), 1998, pp. 191-199

Abstract

The temperature dependence of oxic mineralization processes' in perennially cold coastal sediments from Arctic Svalbard, Norway, was determined in short-term incubations at -1 to 44 degrees C and compared to similar incubations with warm temperate sediment. For oxygen respiration, nitrogen mineralization, and nitrification, adaptations to low temperature were evident with the microbial communities from Svalbard. Oxygen respiration rates showed the same temperature dependence at all sites around Svalbard, with relatively high rates at 0 degrees C and a linear 3- to 4-fold increase from 0 degrees C to a mean optimum temperature of 19.2 degrees C, whereas rates in the temperate sediment were close to zero at 0 degrees C and had optimum at 30 to 40 degrees C. Thetemperature dependence of nitrogen mineralization was comparable to that of oxygen respiration, and C:N mineralization ratios in the Svalbard sediments were stable at 6 to 8 below 20 degrees C. Thus, low temperature did not affect carbon and nitrogen mineralization differentially. The most prominent adaptation to low temperatures was observed for nitrification, which had a mean optimum temperature of 14.0 degrees C at Svalbard and decreased rapidly in rate at higher temperatures. In the warm temperate sediment the nitrification optimum was near 40 degrees C. The catalytic efficiency of the nitrifying communities from Svalbard, at their in situ temperature, was as high as that reported for communities from temperate regions. This implied that thermal adaptation fully compensated for direct temperature effects on this metabolism.

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Documento generato il 07/04/20 alle ore 23:05:32